怎样算简便就怎样算．①= ②= ③= ④= ．
口算．============
直接写得数×12= 0.45×2= 34×0.2= ÷2=10×= 9.9+2.43+0.1= ×= 6.8×2.5=
直接写出得数．×= 40%+50%= 81÷= 9.9÷0.1=3.52+6.48= 1%÷= ×2÷×2=
直接写出得数：7×= ÷6= ÷= ÷=÷= ×0.15= ÷= 4×60%=
直接写得数．×8= ÷2= ÷= ×=10×= ﹣= += 21×=÷9= ÷=
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×12= 0.45×2= 34×0.2= 
÷2=
= 9.9+2.43+0.1= 
×
= 6.8×2.5=
×
= 40%+50%= 81÷
= 9.9÷0.1=
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×2÷
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÷6= 
÷
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÷
÷
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×0.15= 
÷
= 4×60%=
×8= 
÷2= 
÷
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×
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﹣
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+
= 21×
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÷9= 
÷
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